Turkish President Recep Tayyip Erdoğan has rejected the findings of the Organisation for Security and Co-operation in Europe (OSCE) that claimed his victorious referendum result to seize new powers was marred by "inequality" and biased media.

Erdoğan has boldly told the observational group, who have carried out their investigation from 17 March, "know your place".

Head of the observation mission, Tana de Zulueta, said voting freedoms had been violated due to restricted access to a "plurality of views" by the media.

She said: "Our monitoring showed the 'Yes' campaign dominated the media coverage and this, along with restrictions on the media, the arrests of journalists and the closure of media outlets, reduced voters' access to a plurality of views."

The OSCE is a European human rights body which Turkey is a member of. More than 80% of voters turned out in the ballot which gives sweeping new powers to Erdoğan. Opposition parties said they will contest the result and the Republican People's party, the largest bloc in the opposition, said the result should be annulled.